Application time for non-serving cell reference signal update

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, an indication of an update associated with a non-serving cell reference signal. The UE may select a first application time duration based at least in part on a determination that the non-serving cell reference signal has been tracked by the UE or a second application time duration based at least in part on a determination that the non-serving cell reference signal has not been tracked by the UE, resulting in a selected application time duration. The UE may apply the update associated with the non-serving cell reference signal after the selected application time duration. Numerous other aspects are described.

What is claimed is: 
     
       1. A user equipment (UE) for wireless communication, comprising:
 one or more memories; and 
 one or more processors, coupled to the one or more memories, configured to:
 receive, from a network entity, an indication of an update associated with a non-serving cell reference signal of a non-serving cell, wherein the indication includes a beam indication to use a transmission configuration indicator (TCI) state associated with the non-serving cell reference signal for receiving at least one of a scheduled aperiodic reference signal or a scheduled physical downlink shared channel (PDSCH) communication; 
 select an application time duration from a first application time duration and a second application time duration based at least in part on receiving the indication of the update, the first application time duration being selected based at least in part on a determination that the non-serving cell reference signal has been tracked by the UE and the second application time duration being selected based at least in part on a determination that the non-serving cell reference signal has not been tracked by the UE, wherein a determination of whether the non-serving cell reference signal has been tracked by the UE is based at least in part on a determination of whether at least one of a tracking reference signal or a channel state information reference signal has been configured for the UE on the TCI state associated with the non-serving cell reference signal, wherein the second application time duration is longer than the first application time duration, and the second application time duration includes at least a time duration associated with the UE performing time and frequency synchronization on the TCI state associated with the non-serving cell reference signal; and 
 apply the update associated with the non-serving cell reference signal after the selected application time duration. 
 
 
     
     
       2. The UE of  claim 1 , wherein the selected application time duration is counted from a time at which the UE receives the indication. 
     
     
       3. The UE of  claim 1 , wherein the one or more processors are further configured to:
 transmit, to the network entity, an acknowledgment based at least in part on receiving the indication, wherein the selected application time duration is counted from a time at which the UE transmits the acknowledgment. 
 
     
     
       4. The UE of  claim 1 , wherein the indication includes an indication to update a transmission configuration indicator (TCI) state for a non-serving cell to a TCI state associated with the non-serving cell reference signal. 
     
     
       5. The UE of  claim 4 , wherein a determination of whether the non-serving cell reference signal has been tracked by the UE is based at least in part on a determination of whether the UE has been configured to monitor the non-serving cell reference signal for inter-cell mobility measurements. 
     
     
       6. The UE of  claim 1 , wherein, to apply the update associated with the non-serving cell reference signal, the one or more processors are configured to:
 receive, after the selected application time duration, the at least one of the scheduled aperiodic reference signal or the scheduled PDSCH communication using the TCI state associated with the non-serving cell reference signal. 
 
     
     
       7. The UE of  claim 1 , wherein the indication includes an indication to use the non-serving cell reference signal as a path loss reference signal for an uplink channel. 
     
     
       8. The UE of  claim 7 , wherein a determination of whether the non-serving cell reference signal has been tracked by the UE is based at least in part on a determination of whether the non-serving cell reference signal has been configured as a path loss reference signal for the UE. 
     
     
       9. The UE of  claim 8 , wherein the second application time duration is longer than the first application time duration, and the second application time duration includes at least a time duration associated with multiple occurrences of the non-serving cell reference signal. 
     
     
       10. The UE of  claim 7 , wherein, to apply the update associated with the non-serving cell reference signal, the one or more processors are configured to:
 transmit, after the selected application time duration, an uplink communication on the uplink channel using a transmission power determined from a path loss estimation based at least in part on measurements of the non-serving cell reference signal. 
 
     
     
       11. The UE of  claim 1 , wherein the one or more processors are configured to:
 transmit, to the network entity, a UE capability report indicating at least one of a first duration value associated with a tracked non-serving cell reference signal or a second duration value associated with a non-tracked non-serving cell reference signal, wherein at least one of the first application time duration or the second application time duration is based at least in part on the at least one of the first duration value or the second duration value. 
 
     
     
       12. The UE of  claim 11 , wherein the UE capability report indicates the first duration value, the first application time duration is based at least in part on the first duration value, and the second application time duration is determined based at least in part on the first application time duration. 
     
     
       13. A network entity for wireless communication, comprising:
 one or more memories; and 
 one or more processors, coupled to the one or more memories, configured to:
 transmit, to a UE, an indication of an update associated with a non-serving cell reference signal of a non-serving cell; 
 select an application time duration from a first application time duration and a second application time duration based at least in part on receiving the indication of the update, the first application time duration being selected based at least in part on a determination that the non-serving cell reference signal has been tracked by the UE and the second application time duration being selected based at least in part on a determination that the non-serving cell reference signal has not been tracked by the UE, resulting in a selected application time duration; 
 apply the update associated with the non-serving cell reference signal after the selected application time duration; 
 receive, from the UE, a UE capability report indicating at least one of a first duration value associated with a tracked non-serving cell reference signal or a second duration value associated with a non-tracked non-serving cell reference signal; and 
 determine at least one of the first application time duration or the second application time duration based at least in part on the at least one of the first duration value or the second duration value. 
 
 
     
     
       14. The network entity of  claim 13 , wherein the indication includes an indication to update a transmission configuration indicator (TCI) state for a non-serving cell to a TCI state associated with the non-serving cell reference signal, and wherein a determination of whether the non-serving cell reference signal has been tracked by the UE is based at least in part on a determination of whether the UE has been configured to monitor the non-serving cell reference signal for inter-cell mobility measurements. 
     
     
       15. The network entity of  claim 13 , wherein the indication includes a beam indication to use a transmission configuration indicator (TCI) state associated with the non-serving cell reference signal for receiving at least one of a scheduled aperiodic reference signal or a scheduled physical downlink shared channel (PDSCH) communication, and wherein a determination of whether the non-serving cell reference signal has been tracked by the UE is based at least in part on a determination of whether at least one of a tracking reference signal or a channel state information reference signal has been configured for the UE on the TCI state associated with the non-serving cell reference signal. 
     
     
       16. The network entity of  claim 13 , wherein the indication includes an indication to use the non-serving cell reference signal as a path loss reference signal for an uplink channel, and wherein a determination of whether the non-serving cell reference signal has been tracked by the UE is based at least in part on a determination of whether the non-serving cell reference signal has been configured as a path loss reference signal for the UE. 
     
     
       17. The network entity of  claim 13 , wherein the UE capability report indicates the first duration value, and wherein, to determine at least one of the first application time duration or the second application time duration, the one or more processors are configured to:
 determine the first application time duration based at least in part on the first duration value; 
 derive the second duration value from the first duration value; and 
 determine the second application time duration based at least in part on the second duration value. 
 
     
     
       18. A method of wireless communication performed by a user equipment (UE), comprising:
 receiving, from a network entity, an indication of an update associated with a non-serving cell reference signal of a non-serving cell, wherein the indication includes an indication to use the non-serving cell reference signal as a path loss reference signal for an uplink channel, and wherein a determination of whether the non-serving cell reference signal has been tracked by the UE is based at least in part on a determination of whether the non-serving cell reference signal has been configured as a path loss reference signal for the UE; 
 selecting an application time duration from a first application time duration and a second application time duration based at least in part on receiving the indication of the update, the first application time duration being selected based at least in part on a determination that the non-serving cell reference signal has been tracked by the UE and the second application time duration being selected based at least in part on a determination that the non-serving cell reference signal has not been tracked by the UE, resulting in a selected application time duration; and 
 applying the update associated with the non-serving cell reference signal after the selected application time duration, wherein applying the update associated with the non-serving cell reference signal comprises: 
 transmitting, after the selected application time duration, an uplink communication on the uplink channel using a transmission power determined from a path loss estimation based at least in part on measurements of the non-serving cell reference signal. 
 
     
     
       19. The method of  claim 18 , wherein the indication includes an indication to update a transmission configuration indicator (TCI) state for a non-serving cell to a TCI state associated with the non-serving cell reference signal, and wherein a determination of whether the non-serving cell reference signal has been tracked by the UE is based at least in part on a determination of whether the UE has been configured to monitor the non-serving cell reference signal for inter-cell mobility measurements. 
     
     
       20. The method of  claim 18 , wherein the indication includes a beam indication to use a transmission configuration indicator (TCI) state associated with the non-serving cell reference signal for receiving at least one of a scheduled aperiodic reference signal or a scheduled physical downlink shared channel (PDSCH) communication, and wherein a determination of whether the non-serving cell reference signal has been tracked by the UE is based at least in part on a determination of whether at least one of a tracking reference signal or a channel state information reference signal has been configured for the UE on the TCI state associated with the non-serving cell reference signal. 
     
     
       21. The method of  claim 20 , wherein applying the update associated with the non-serving cell reference signal comprises:
 receiving, after the selected application time duration, the at least one of the scheduled aperiodic reference signal or the scheduled PDSCH communication using the TCI state associated with the non-serving cell reference signal. 
 
     
     
       22. The method of  claim 18 , further comprising:
 transmitting, to the network entity, a UE capability report indicating at least one of a first duration value associated with a tracked non-serving cell reference signal or a second duration value associated with a non-tracked non-serving cell reference signal, wherein at least one of the first application time duration or the second application time duration is based at least in part on the at least one of the first duration value or the second duration value. 
 
     
     
       23. The method of  claim 22 , wherein the UE capability report indicates the first duration value, the first application time duration is based at least in part on the first duration value, and the second application time duration is determined based at least in part on the first application time duration. 
     
     
       24. A method of wireless communication performed by a network entity, comprising:
 transmitting, to a user equipment (UE), an indication of an update associated with a non-serving cell reference signal of a non-serving cell; 
 selecting an application time duration from a first application time duration and a second application time duration based at least in part on receiving the indication of the update, the first application time duration being selected based at least in part on a determination that the non-serving cell reference signal has been tracked by the UE and the second application time duration being selected based at least in part on a determination that the non-serving cell reference signal has not been tracked by the UE, resulting in a selected application time duration; 
 applying the update associated with the non-serving cell reference signal after the selected application time duration; 
 receiving, from the UE, a UE capability report indicating at least one of a first duration value associated with a tracked non-serving cell reference signal or a second duration value associated with a non-tracked non-serving cell reference signal; and 
 determining at least one of the first application time duration or the second application time duration based at least in part on the at least one of the first duration value or the second duration value.